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  <span class="token comment">// 用于标记fiber的WorkTag类型，主要表示当前fiber代表的组件类型如FunctionComponent、ClassComponent等</span>
  tag<span class="token operator">:</span> WorkTag<span class="token punctuation">,</span>
  <span class="token comment">// ReactElement里面的key</span>
  key<span class="token operator">:</span> <span class="token keyword">null</span> <span class="token operator">|</span> string<span class="token punctuation">,</span>
  <span class="token comment">// ReactElement.type，调用`createElement`的第一个参数</span>
  elementType<span class="token operator">:</span> any<span class="token punctuation">,</span>
  <span class="token comment">// The resolved function/class/ associated with this fiber.</span>
  <span class="token comment">// 表示当前代表的节点类型</span>
  type<span class="token operator">:</span> any<span class="token punctuation">,</span>
  <span class="token comment">// 表示当前FiberNode对应的element组件实例</span>
  stateNode<span class="token operator">:</span> any<span class="token punctuation">,</span>

  <span class="token comment">// 指向他在Fiber节点树中的`parent`，用来在处理完这个节点之后向上返回</span>
  <span class="token keyword">return</span><span class="token operator">:</span> Fiber <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
  <span class="token comment">// 指向自己的第一个子节点</span>
  child<span class="token operator">:</span> Fiber <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
  <span class="token comment">// 指向自己的兄弟结构，兄弟节点的return指向同一个父节点</span>
  sibling<span class="token operator">:</span> Fiber <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
  index<span class="token operator">:</span> number<span class="token punctuation">,</span>

  ref<span class="token operator">:</span> <span class="token keyword">null</span> <span class="token operator">|</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">handle<span class="token operator">:</span> mixed</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token punctuation">{</span> _stringRef<span class="token operator">:</span> <span class="token operator">?</span>string <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token operator">|</span> RefObject<span class="token punctuation">,</span>

  <span class="token comment">// 当前处理过程中的组件props对象</span>
  pendingProps<span class="token operator">:</span> any<span class="token punctuation">,</span>
  <span class="token comment">// 上一次渲染完成之后的props</span>
  memoizedProps<span class="token operator">:</span> any<span class="token punctuation">,</span>

  <span class="token comment">// 该Fiber对应的组件产生的Update会存放在这个队列里面</span>
  updateQueue<span class="token operator">:</span> UpdateQueue<span class="token operator">&lt;</span>any<span class="token operator">&gt;</span> <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>

  <span class="token comment">// 上一次渲染的时候的state</span>
  memoizedState<span class="token operator">:</span> any<span class="token punctuation">,</span>

  <span class="token comment">// 一个列表，存放这个Fiber依赖的context</span>
  firstContextDependency<span class="token operator">:</span> ContextDependency<span class="token operator">&lt;</span>mixed<span class="token operator">&gt;</span> <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>

  mode<span class="token operator">:</span> TypeOfMode<span class="token punctuation">,</span>

  <span class="token comment">// Effect</span>
  <span class="token comment">// 用来记录Side Effect</span>
  effectTag<span class="token operator">:</span> SideEffectTag<span class="token punctuation">,</span>

  <span class="token comment">// 单链表用来快速查找下一个side effect</span>
  nextEffect<span class="token operator">:</span> Fiber <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>

  <span class="token comment">// 子树中第一个side effect</span>
  firstEffect<span class="token operator">:</span> Fiber <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
  <span class="token comment">// 子树中最后一个side effect</span>
  lastEffect<span class="token operator">:</span> Fiber <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>

  <span class="token comment">// 代表任务在未来的哪个时间点应该被完成，之后版本改名为 lanes</span>
  expirationTime<span class="token operator">:</span> ExpirationTime<span class="token punctuation">,</span>

  <span class="token comment">// 快速确定子树中是否有不在等待的变化</span>
  childExpirationTime<span class="token operator">:</span> ExpirationTime<span class="token punctuation">,</span>

  <span class="token comment">// fiber的版本池，即记录fiber更新过程，便于恢复</span>
  alternate<span class="token operator">:</span> Fiber <span class="token operator">|</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="三、如何解决"><a href="#三、如何解决" class="header-anchor">#</a> 三、如何解决</h2> <p><code>Fiber</code>把渲染更新过程拆分成多个子任务，每次只做一小部分，做完看是否还有剩余时间，如果有继续下一个任务；如果没有，挂起当前任务，将时间控制权交给主线程，等主线程不忙的时候在继续执行</p> <p>即可以中断与恢复，恢复后也可以复用之前的中间状态，并给不同的任务赋予不同的优先级，其中每个任务更新单元为 <code>React Element</code> 对应的 <code>Fiber</code>节点</p> <p>实现的上述方式的是<code>requestIdleCallback</code>方法</p> <p><code>window.requestIdleCallback()</code>方法将在浏览器的空闲时段内调用的函数排队。这使开发者能够在主事件循环上执行后台和低优先级工作，而不会影响延迟关键事件，如动画和输入响应</p> <p>首先 React 中任务切割为多个步骤，分批完成。在完成一部分任务之后，将控制权交回给浏览器，让浏览器有时间再进行页面的渲染。等浏览器忙完之后有剩余时间，再继续之前 React 未完成的任务，是一种合作式调度。</p> <p>该实现过程是基于 <code>Fiber</code>节点实现，作为静态的数据结构来说，每个 <code>Fiber</code> 节点对应一个 <code>React element</code>，保存了该组件的类型（函数组件/类组件/原生组件等等）、对应的 DOM 节点等信息。</p> <p>作为动态的工作单元来说，每个 <code>Fiber</code> 节点保存了本次更新中该组件改变的状态、要执行的工作。</p> <p>每个 Fiber 节点有个对应的 <code>React element</code>，多个 <code>Fiber</code>节点根据如下三个属性构建一颗树：</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token comment">// 指向父级Fiber节点</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>return <span class="token operator">=</span> <span class="token keyword">null</span>
<span class="token comment">// 指向子Fiber节点</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>child <span class="token operator">=</span> <span class="token keyword">null</span>
<span class="token comment">// 指向右边第一个兄弟Fiber节点</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>sibling <span class="token operator">=</span> <span class="token keyword">null</span>
</code></pre></div><p>通过这些属性就能找到下一个执行目标</p> <h2 id="参考文献"><a href="#参考文献" class="header-anchor">#</a> 参考文献</h2> <ul><li>https://juejin.cn/post/6926432527980691470</li> <li>https://zhuanlan.zhihu.com/p/137234573</li> <li>https://vue3js.cn/interview</li></ul></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">更新时间:</span> <span class="time">12/14/2021, 10:49:32 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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